GPAI Ledger › Claude Mythos Preview (Anthropic) › Capture 29 Aug 2026
Claude Mythos Preview — capture 20260829T185147Z
| Provider | Anthropic |
|---|---|
| Target | AIAL evaluation (earlier state) — https://raw.githubusercontent.com/AIAccountabilityLab/gpai-training-transparency/fb0dc932d4685c18e0fd0d590eb52bbeb1ceb783/evals/claude-mythos-preview.yaml |
| Fetched (UTC) | 2026-08-29T18:51:47Z |
| Upstream commit | 4 Aug 2026 — fb0dc932d468 (when this state began to stand in the upstream repository; this archive fetched it at the time above, not then) |
| Stored file | 4,963 bytes — not served (third-party research, archived but not republished here); the hash and timestamp proof below still establish what was published when |
| SHA-256 | 3058db85172bd8e4765502d7fec20b4983b3ba59d1062693bcebb09c51ef1146 |
| OpenTimestamps proof | 3058db85172bd8e4765502d7fec20b4983b3ba59d1062693bcebb09c51ef1146.yaml.20260829T185147Z.ots (calendar-attested; anchored in bitcoin over time) |
| Wayback | not saved |
| Prior capture of this target | 6c03d73526e62b3fd2d6c6280c33adf582dc0a8fdd5f00961907ed76e8978205 (captured 2026-08-29T18:49:13Z) |
Verify: obtain the file from the target address above, then sha256sum it — it must equal the hash above; the .ots proof dates that hash.
Structured facts
This is another organisation's own research, and this project does not redistribute it: the file itself is not served here; these facts still pin its identity and let any copy be authenticated against this record.
| Document size | 4,963 bytes |
|---|---|
| Canonical text SHA-256 | 81565d6e184c9d2b2eccfc4b37a0250e1edd7cc74ef5d035a9cc2f93a282c329 |
| Extracted text length | 644 words |